<template>
  <el-menu
    :default-active="activeMenu"
    mode="horizontal"
    @select="handleSelect"
    :ellipsis="false"
  >
    <template v-for="(item, index) in topMenus">
      <el-menu-item :style="{'--theme': theme}" :index="item.path" :key="index" v-if="index < visibleNumber"
        ><svg-icon :icon-class="item.meta.icon" />
        {{ item.meta.title }}</el-menu-item
      >
    </template>

    <!-- 顶部菜单超出数量折叠 -->
    <el-sub-menu :style="{'--theme': theme}" index="more" v-if="topMenus.length > visibleNumber">
      <template #title>更多菜单</template>
      <template v-for="(item, index) in topMenus">
        <el-menu-item
          :index="item.path"
          :key="index"
          v-if="index >= visibleNumber"
          ><svg-icon :icon-class="item.meta.icon" />
          {{ item.meta.title }}</el-menu-item
        >
      </template>
    </el-sub-menu>
  </el-menu>
</template>

<script setup>
  import { constantRoutes } from "@/router"
  import { isHttp } from '@/utils/validate'
  import useAppStore from '@/store/modules/app'
  import useSettingsStore from '@/store/modules/settings'
  import usePermissionStore from '@/store/modules/permission'

  // 顶部栏初始数
  const visibleNumber = ref(null)
  // 当前激活菜单的 index
  const currentIndex = ref(null)
  // 隐藏侧边栏路由
  const hideList = ['/index', '/user/profile']

  const appStore = useAppStore()
  const settingsStore = useSettingsStore()
  const permissionStore = usePermissionStore()
  const route = useRoute()
  const router = useRouter()

  // 主题颜色
  const theme = computed(() => settingsStore.theme)
  // 所有的路由信息
  const routers = computed(() => permissionStore.topbarRouters)

  // 顶部显示菜单
  const topMenus = computed(() => {
    let topMenus = []
    routers.value.map((menu) => {
      if (menu.hidden !== true) {
        // 兼容顶部栏一级菜单内部跳转
        if (menu.path === "/") {
          topMenus.push(menu.children[0])
        } else {
          topMenus.push(menu)
        }
      }
    })
    return topMenus
  })

  // 设置子路由
  const childrenMenus = computed(() => {
    let childrenMenus = []
    routers.value.map((router) => {
      for (let item in router.children) {
        if (router.children[item].parentPath === undefined) {
          if(router.path === "/") {
            router.children[item].path = "/" + router.children[item].path
          } else {
            if(!isHttp(router.children[item].path)) {
              router.children[item].path = router.path + "/" + router.children[item].path
            }
          }
          router.children[item].parentPath = router.path
        }
        childrenMenus.push(router.children[item])
      }
    })
    return constantRoutes.concat(childrenMenus)
  })

  // 默认激活的菜单
  const activeMenu = computed(() => {
    const path = route.path
    let activePath = path
    if (path !== undefined && path.lastIndexOf("/") > 0 && hideList.indexOf(path) === -1) {
      const tmpPath = path.substring(1, path.length)
      activePath = "/" + tmpPath.substring(0, tmpPath.indexOf("/"))
      if (!route.meta.link) {
        appStore.toggleSideBarHide(false)
      }
    } else if(!route.children) {
      activePath = path
      appStore.toggleSideBarHide(true)
    }
    activeRoutes(activePath)
    return activePath
  })

  function setVisibleNumber() {
    const width = document.body.getBoundingClientRect().width / 3
    visibleNumber.value = parseInt(width / 85)
  }

  function handleSelect(key, keyPath) {
    currentIndex.value = key
    const route = routers.value.find(item => item.path === key)
    if (isHttp(key)) {
      // http(s):// 路径新窗口打开
      window.open(key, "_blank")
    } else if (!route || !route.children) {
      // 没有子路由路径内部打开
      const routeMenu = childrenMenus.value.find(item => item.path === key)
      if (routeMenu && routeMenu.query) {
        let query = JSON.parse(routeMenu.query)
        router.push({ path: key, query: query })
      } else {
        router.push({ path: key })
      }
      appStore.toggleSideBarHide(true)
    } else {
      // 显示左侧联动菜单
      activeRoutes(key)
      appStore.toggleSideBarHide(false)
    }
  }

  function activeRoutes(key) {
    let routes = []
    if (childrenMenus.value && childrenMenus.value.length > 0) {
      childrenMenus.value.map((item) => {
        if (key == item.parentPath || (key == "index" && "" == item.path)) {
          routes.push(item)
        }
      })
    }
    if(routes.length > 0) {
      permissionStore.setSidebarRouters(routes)
    } else {
      appStore.toggleSideBarHide(true)
    }
    return routes
  }

  onMounted(() => {
    window.addEventListener('resize', setVisibleNumber)
  })
  onBeforeUnmount(() => {
    window.removeEventListener('resize', setVisibleNumber)
  })

  onMounted(() => {
    setVisibleNumber()
  })
</script>

<style lang="scss">
.topmenu-container.el-menu--horizontal > .el-menu-item {
  float: left;
  height: 50px !important;
  line-height: 50px !important;
  color: #999093 !important;
  padding: 0 5px !important;
  margin: 0 10px !important;
}

.topmenu-container.el-menu--horizontal > .el-menu-item.is-active, .el-menu--horizontal > .el-sub-menu.is-active .el-submenu__title {
  border-bottom: 2px solid #{'var(--theme)'} !important;
  color: #303133;
}

/* sub-menu item */
.topmenu-container.el-menu--horizontal > .el-sub-menu .el-sub-menu__title {
  float: left;
  height: 50px !important;
  line-height: 50px !important;
  color: #999093 !important;
  padding: 0 5px !important;
  margin: 0 10px !important;
}
</style>
